<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>H标签</title>
</head>
<body>

<h1>这是h1</h1>
<h2>这是h2</h2>
<h3>这是h3</h3>
<h4>这是h4</h4>
<h5>这是h5</h5>
<h6>这是h6</h6>

</body>
</html>